/*
 * The MIT License
 * Copyright (c) 2011 kc4.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.kc4.util;

import java.lang.reflect.Method;
import java.util.HashMap;

/**
 * リフレクションによるメソッドの引き当てをキャッシュします。
 *
 * @author yoichi kikuchi
 * @since 1.0.0
 */
public class MethodCache extends HashMap<MethodSignature, Method> {

	private static final long serialVersionUID = 1L;

	/**
	 * メソッドを検索します。
	 *
	 * @param signature メソッドシグネチャ。
	 * @return メソッド。
	 */
	protected Method search(final MethodSignature signature) {

		try {

			return signature.getClazz().getMethod(signature.getName(), signature.getArgs());
		}
		catch (NoSuchMethodException e) {

			throw new RuntimeException(e);
		}
	}

	/**
	 * メソッドを取得します。
	 *
	 * @param clazz クラス。
	 * @param name メソッド名。
	 * @param args 引数タイプ。
	 * @return メソッド。
	 */
	public Method get(final Class<?> clazz, final String name, final Class<?>... args) {

		MethodSignature sig = new MethodSignature(clazz, name, args);

		if (this.containsKey(sig)) {

			return this.get(sig);
		}

		Method m = this.search(sig);

		this.put(sig, m);

		return m;
	}
}
